<template>
  <div>
    <!-- 面包屑导航区  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域  -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意: 只允许为第三季设置相关的参数!" type="warning" :closable="false" show-icon> </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat-opt">
        <el-col>
          <span>选择商品的分类:</span>
          <!-- 选择商品的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            :options="catelist"
            v-model="selectedCateKeys"
            @change="handleChange"
            :props="cateProps"
          >
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" style="width: 100%" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  type="primary"
                  closable
                  @close="handleClose(index, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)"
                  >编辑</el-button
                >
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableData" style="width: 100%" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index"
                  type="primary"
                  closable
                  @close="handleClose(index, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)"
                  >编辑</el-button
                >
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 这是添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 这是添加参数的表单 -->
      <el-form :model="addFrom" :rules="addFromRules" ref="addFromRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addFrom.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 这是修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 这是修改参数的表单 -->
      <el-form :model="editFrom" :rules="addFromRules" ref="editFromRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editFrom.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      // 所有商品分类的数据
      catelist: [],
      // 指定级联选择器的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'only',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 添加参数的表单数据对象
      addFrom: {},
      // 修改的表单数据对象
      editFrom: {},
      // 添加表单的验证规则对象
      addFromRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    // 获取所有的商品分类列表
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: {
          type: 3
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取商品分类信息失败!')
      this.catelist = res.data
    },
    // 级联选择框选中项的变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.onlyTableData = []
        this.manyTableData = []
        return
      }
      // 证明选中的是三级分类

      //根据所选分类的Id，和当前所处的面板 ，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败!')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFromRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addFrom.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error(`添加${this.titleText}失败!`)
        this.$message.success(`添加${this.titleText}成功!`)
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 点击按钮展示修改的对话框
    async showEditDialog({ cat_id, attr_id }) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${cat_id}/attributes/${attr_id}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败!')
      this.editFrom = res.data
      this.editDialogVisible = true
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFromRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editFrom.attr_id}`, {
          attr_name: this.editFrom.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数信息失败!')
        this.$message.success('修改参数信息成功!')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数
    async removeParams({ cat_id, attr_id }) {
      const confirmResult = await this.$confirm('此操作将永久删除该商品信息 , 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 取消的返回值是 cancel
      // 确认的返回值是 confirm
      if (confirmResult !== 'confirm') return this.$message.info('取消了删除操作！')
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${cat_id}/attributes/${attr_id}`)
      console.log(res)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败!')
      this.$message.success('删除参数成功!')
      this.getParamsData()
    },
    // 文本框失去了焦点 或者 按下了enter键都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return，则证明输入了结果,需要做后续的处理、
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求保存这次操作
      this.saveAttrValues(row)
    },
    // 点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用,就是当页面上元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将对 attr_vals 的操作,保存到数据库
    async saveAttrValues(row) {
      const { data: res } = await this.$http.put(`categories/${row.cat_id}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: this.activeName,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败!')
      this.$message.success('修改参数项成功!')
    },
    handleClose(i, row) {
      // 删除对应的参数可选项
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    }
  },

  computed: {
    // 如果按钮要被禁用，则返回true，否则返回false
    isBtnDisable() {
      return this.selectedCateKeys.length ? false : true
    },
    // 当前选中的三级分类的ID
    cateId() {
      return this.selectedCateKeys[this.selectedCateKeys.length - 1] || null
    },
    // 动态计算标题的文本
    titleText() {
      return this.activeName === 'only' ? '静态属性' : '动态参数'
    }
  }
}
</script>

<style lang="scss" scoped>
.cat-opt {
  margin: 15px 0;
}
.el-tag {
  margin: 7px;
}
.input-new-tag {
  width: 100px;
}
</style>
